Equal Sums

<?php
$array = explode(' ', readline());

for ($i = 0; $i < count($array); $i++) {
    $leftSum = 0;
    $rightSum = 0;
    for ($j = 0; $j < count($array); $j++) {
        if($i < $j){
            $leftSum+= (int)$array[$j];
        }else if ($i > $j){
            $rightSum+= (int)$array[$j];
        }
    }
    if($leftSum === $rightSum){
        echo $i;
        return;
    }
}
if(count($array)===1){
    echo 0;
}else {
    echo 'no';
}